He is a lonely soul from another world, attached to a wisp of misty smoke, and makes a living by sucking human emotions. Human emotions of anger, anxiety, shyness, excitement, sadness, grief, pity, etc. Sometimes the taste is very light, with a mint scent, which makes him happy as if he is enjoying a rare coolness in the hot summer. Sometimes the flavor was rich, like a stock that had been simmered for hours, which made his taste buds feel satisfied. The degree of emotion is different, and the taste is also different. He has truly "tasted" all kinds of emotions in this world.
Unexpectedly, while foraging for food, he accidentally broke into a man's house and discovered that there were still people in the world whose emotions he couldn't eat. The worst part is that not only can't he eat, but he is also trapped in this man's house! And this indifferent man's house won't see another human being for a week. If this continues, he should disappear completely, but it would be too unpleasant for a ghost to starve to death...